Magneto-Chiral Anisotropy in Carbon Nanotubes

Chiral conductors exist in two forms which are mirror images of each other and have different handedness. The nonlinear term of current in powers of voltage is an odd function of magnetic field and its coefficient in chiral conductors depends on the handedness and electron-electron interactions. Due to the importance of electron-electron interactions in carbon nanotubes and their large magneto-chiral anisotropy, they are one of the best candidates to study nonlinear magneto-transport in chiral conductors. In this work we use ultra clean suspended carbon nanotubes to investigate electrical magneto-chiral anisotropy in these materials, which can be used as a probe to deduce the electron-electron interaction strength and handedness of the tubes. Using photocurrent spectroscopy, we identify our nanotubes’ structure to compare the transport data with the existing theories.